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Merged
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Apr 28, 2020
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About locking with REORGANIZE #4011

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About locking with REORGANIZE
rrg92 Jan 23, 2020
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Enhaced description about effects of autocommit and REORGANIZE
rrg92 Apr 28, 2020
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Enhacements on text about locking
rrg92 Apr 28, 2020
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ktoliver Apr 28, 2020
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5 changes: 4 additions & 1 deletion docs/t-sql/statements/alter-index-transact-sql.md
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Expand Up @@ -252,11 +252,14 @@ PARTITION
REORGANIZE a **rowstore** index
For rowstore indexes, REORGANIZE specifies to reorganize the index leaf level. The REORGANIZE operation is:

- Always performed online. This means long-term blocking table locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX REORGANIZE transaction.
- Always performed online. This means long-term blocking table locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX REORGANIZE transaction.
- Not allowed for a disabled index
- Not allowed when ALLOW_PAGE_LOCKS is set to OFF
- Not rolled back when it is performed within a transaction and the transaction is rolled back.

> [!NOTE]
> If using explicit transactions instead of the default implicit transaction mode (e.g., ALTER INDEX within BEGIN TRAN ... COMMIT/ROLLBACK), the locking behavior of REORGANIZE becomes more restrictive. For more information on implicit transactions, see [SET IMPLICIT_TRANSACTIONS (Transact-SQL)](../../t-sql/statements/set-implicit-transactions-transact-sql.md)

For more information, see [Reorganize and Rebuild Indexes](../../relational-databases/indexes/reorganize-and-rebuild-indexes.md).

REORGANIZE WITH **(** LOB_COMPACTION = { **ON** | OFF } **)**
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